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Pratt & Whitney 3C mill

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DiscoDan

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Picked up a 3c mill today. In great condition. Has one if the unobtainium collets but I will see if I can retrofit a more common one. Motor is an interesting variable speed Craftsman motor. Will post pics tomorrow when I get it in the shop.
 

Martin W

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Hi
What year would this be? Did you get the vertical head?
Waiting for pics :)
Cheers
Martin
 

DiscoDan

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It is WW2 because it has a war production board tag on it. No vertical head but I have seen plans on YouTube to build one. Also keeping eyes open for smaller heads like Rusnok.
 

DiscoDan

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Interesting little mill. Has Craftsman variable speed motor (500 to 5000 rpm). Drive pulley is up inside the housing instead of external. Has one collet (3/4") plus a boring bar. The collets are supposed to be unobtanium 4pn. The one in the machine is the correct 1.000 diameter but is longer than anyythingspecs I see for the 4pn and somewhere between the 4pn and 5pn length. The thread is the correct 16 threads per inch. At least I have one. Everything is tight and works smoothly. Someone removed the x-axis lead screw and replaced with the speed handle system. I see a P&W screw on ebay that may work but would have to fab the mounting plate that screws to the end of the table. Real happy for $450.
 

DiscoDan

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And the collet doesn't have any markings on the face like I have seen with most P&W collets.
 
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